* "Löendë had arrived": Löendë is a name for Midsummer Day. Canon does not specify (to my knowledge) when exactly the Gondorian day (a twenty-four hour day, not just the daylight hours) began, but most ancient cultures began their days either at sunset or sunrise. The creation story given in The Silmarillion shares many facts with the Genesis account, including the fact that the world began with darkness, and light was later introduced. Therefore it seems logical that Gondorians, being of a Númenórean culture, would have their day begin with darkness--that is, when the sun sets. For the purposes of this story, löendë begins when the sun sets after the last day of Nárië. The custom of Gondorian soldiers remembering their fallen comrades on this date is entirely my own invention, but it seems reasonable.
* "'To Belegorn!'"..."Hirluin." These names are borrowed from many places: The Silmarillion, The Peoples of Middle-earth, and the Rohirric song at the end of "The Battle of the Pelennor Fields," in The Return of the King. They are for the most part not significant and are intended as a set of likely Gondorian and Rohirric names that could refer to any group of dead soldiers.
* Galahir: This character has a larger backstory in Marta!verse, but for the purposes of this story he could be any Gondorian soldier.